white logo and popupTheme

src/App/Pages/Accounts/HomePage.xaml

@@ -18,7 +18,9 @@
                            HorizontalOptions="Start"
                            Clicked="Settings_Clicked" />
         <StackLayout VerticalOptions="CenterAndExpand" Spacing="20">
-            <Image Source="logo.png" 
+            <Image
+                x:Name="_logo"
+                Source="logo.png"
                 VerticalOptions="Center" />
             <Label Text="{u:I18n LoginOrCreateNewAccount}"
                    StyleClass="text-lg"

src/App/Pages/Accounts/HomePage.xaml.cs

@@ -1,4 +1,5 @@
-using System;
+using Bit.App.Utilities;
+using System;
 using Xamarin.Forms;
 
 namespace Bit.App.Pages
@@ -8,6 +9,7 @@ namespace Bit.App.Pages
         public HomePage()
         {
             InitializeComponent();
+            _logo.Source = ThemeManager.GetTheme() == "dark" ? "logo_white.png" : "logo.png";
         }
 
         private void LogIn_Clicked(object sender, EventArgs e)